/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 * 
 *  http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.osgi.tutorial;

import org.osgi.framework.Bundle;
import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.osgi.framework.BundleEvent;
import org.osgi.framework.BundleListener;

/**
 * Simple bundle that print on the console some BundleEvents
 * 
 * @author Filippo Diotalevi filippo.diotalevi at gmail.com
 */
public class BundleCounterActivator implements BundleActivator, BundleListener {
	
	private BundleContext context;

	public void start(BundleContext bc) throws Exception {
		this.context = bc;
		bc.addBundleListener(this);
		printBundleCount();
	}

	public void stop(BundleContext bc) throws Exception {
		bc.removeBundleListener(this);
	}
	
	private void printBundleCount() {
		System.out.println("There are "+context.getBundles().length+" bundles installed");
		int active = 0;
		for (Bundle b : context.getBundles())
		{
			if (b.getState() == Bundle.ACTIVE)
				active++;
		}
		System.out.println(active+" of them are active");
	}


	public void bundleChanged(BundleEvent be) {
		switch (be.getType()) {
		case BundleEvent.INSTALLED:
			System.out.println("Bundle installed");
			printBundleCount();
			break;
		case BundleEvent.UNINSTALLED:
			System.out.println("Bundle uninstalled");
			printBundleCount();
			break;
		case BundleEvent.STARTED:
			System.out.println("Bundle started");
			printBundleCount();
			break;
		case BundleEvent.STOPPED:
			System.out.println("Bundle stopped");
			printBundleCount();
			break;			
		}
	}

}
